wrand - tests 1

tests.ts

const items = [
  { original: "Bronze", weight: 20 },
  { original: "Silver", weight: 10 },
  { original: "Gold", weight: 3 },
  { original: "Platinum", weight: 1 },
];

describe("RandomPicker", () => {
  it("should be created with a list of items with their weight", () => {
    const picker = new RandomPicker(items);

    expect(picker).toBeDefined();
  });

  it("should be able to pick an item", () => {
    const picker = new RandomPicker(items);

    const pickedItem = picker.pick();

    expect(items.some((i) => i.original === pickedItem)).toBeTruthy();
  });

  it("should be able to pick N items", () => {
    const picker = new RandomPicker(items);
    const picked = picker.pickMany(3);

    expect(picked.length).toBe(3);
    expect(
      picked.every((p) => items.some((i) => i.original === p))
    ).toBeTruthy();
  });

  it("works with objects", () => {
    const objectItems = [
      { original: { name: "Bronze" }, weight: 20 },
      { original: { name: "Silver" }, weight: 10 },
      { original: { name: "Gold" }, weight: 3 },
      { original: { name: "Platinum" }, weight: 1 },
    ];
    const picker = new RandomPicker(objectItems);

    const pickedItem = picker.pick();
    expect(
      objectItems.some((item) => item.original.name === pickedItem.name)
    ).toBeTruthy();
  });
});